html,body{
	width:100%;
	height:100%;
}

#my-background{
	width: 100%;
	height: 100%;
	position: relative;
	background-image: url(../img/bg9.jpg);
	background-position: 50% 50%;
	background-size: cover;
	background-repeat: no-repeat;
	margin-left: auto;
	margin-right: auto;
}
